The Tracking Protection Working Group is chartered to work on two complementary initiatives: Tracking Preference Expression (Do Not Track) and Tracking Selection Lists (TSL). The TSL editor’s draft defines a format for interchangeable lists for blocking or allowing tracking elements from Web pages. Last month, at the W3C face-to-face meeting, the working group decided that a sub-group (or “task force”) of those interested in TSLs should work on the specification together.